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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dff921a141098ffbcd833b7650e01003a5f9be9f3722eb1bf728b3fbcdafb6' 
  AND token = 'ugnRK45ldI0bDBMeHPWU4j1cc4ULz18/2t2JEHtu1mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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