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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9968a4cedccecd08d37a9046ffd09dceb6d3802d8bb56d23e22983d75d9ae184' 
  AND token = 'Fpp6HViIwPT7T/DMzaMhutTsF9EIm7/ERms1pqZkeX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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