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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15bb48d47377f6a26c423baaeacf1fa6956da9d615156675a12d037ae70890e' 
  AND token = 'x7fqQATjYd7RTs2dmoeqJN1FFyuUkPgdmecXktOz21c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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