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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1907669fe12a9c81620c962e086bc796474abe90c051159ef618d8a19f5b5980' 
  AND token = '4dm80Mjr9tPHgvkcuRqwQ1GaS4AEsykG7oVjnsI4yXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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