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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ada869c2d2a9f0e247076503b3ce0fd20a9f45106780688b3cda7e45c4b2541' 
  AND token = '3UuC5y56oz1YF/3TIjJ3RXeAow/K6Drxa3sr34BVvwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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