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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63a1f22c6dca00ae749dbf4b452c54d191d2a5fb3859a261ea97c2efde02ac4' 
  AND token = '3De7hJow9n8gwaokebm+zlOWWryhupjb3jYOVJ56Hik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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