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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fb9853ddde19ae387e8669728408c0c1a24d7db134909fd18f1695d9a31d33' 
  AND token = 'dWFiJr/PtJQz7JsDTWMnZAms+2zgr9dTx7+UCsRcAyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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