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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1273f99c25a47c3ea364c385cc2a457587474dbf50f99df0d825ef29c86d88ce' 
  AND token = 'Cbehlrx7N27A4sKBWRlD/tLJmY5yPIRfvnJfcu6BDKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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