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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af00214debc8b1a4d0f3ad3962f302126e88d39d38fce9f7b7a1ed3b6cb5dcf5' 
  AND token = 'aRoSjnlhfVtbM/bRNCK7kiP8AHp/QO/jsLDxF89t+G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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