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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c3c2feaee58fb10223810d182df4df83e674ea5a9f41bd39930b81c9c9634d' 
  AND token = 'LtrYlYUt/eX9O2hG8pmCWj5R//6Yg2UHp8QRcQdIY6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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