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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9353ecceaa9d8c1842bf2263dca371a4c62453ad9f8d2f1ac782a5b3711871f4' 
  AND token = '9N/f7GVK8odkL1aiHZ66p7I9tb/F3gmM3pLpjHb+8r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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