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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c4974f5bd896790e5998e1add5ccf31981b0a14162eb8a9fbaa26dc2cd7d68' 
  AND token = 'nSe6qi2rW9AXF9VWmg9w22WFTg46KrDsbgED1RNAp4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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