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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f08a91acbf2601aeef63f4f26a9447b72d350af1541f30e8e73417c87a0497f' 
  AND token = 'MAJUAWLGvv4vyAJh5jfiTgbbNV9d1KJ7nA7m/xmW36Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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