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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ca4087a17a5e8536605d7ec07d105414c56ed1854440470b1e1b34863551b2' 
  AND token = '7aefhDMHQtoSdc1KEEfDvKFVQFEtcNnLrYdk7dH9MIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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