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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdab169a14e37689f59252d53e7154d1cac3cc7666838b9d20e136e33c4c6b7' 
  AND token = 'Xujt3j94FKZWhZblsmsA84q8cNthR3TkiVabFD+TxF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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