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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70b6d0ed7d2abfaecbd4d2c6d3b7a8cc925f7828a0cebe7a49ae953fb93e047' 
  AND token = 'tWaabMJtAmEqKL1xo299PKr20B680m71uGo1paDUXhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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