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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a861b2a0b4b49b3b9d6590972da0c6b60306e7c15fd3ede303407fb0ae9712cf' 
  AND token = 'Q8tsw4TdY5GrgUou0ah5oLvbJ4WKJcwxNoP9E949wZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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