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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea85be6c1521312b6fa709fa134624d96717eb7cc37375dc744f77bc82b67778' 
  AND token = 'lCu7NELrhDOTpM5JoqPK570KBzXs10J93GF7P4E5WJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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