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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7212f531991eb68741eec0fba6d0242a2c6e6b55d2dea91500be7eabf7c5968d' 
  AND token = 'O9kceqaIdtlGjsHyvxCHnBlSjgLOs6l7nUk9vJemG2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}