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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c913ff3c869653704dcbb0f0fead2c53dbe49bd9fe28c1b54e01b2e1ed1bf56d' 
  AND token = 'oxVKMFTn8J9smRX9PTur4ktnuHIxy/DpqZ4Q0eovYkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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