SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08225a6f37ed6272f342fe1f2d127233578eaa44156a4cb211a3dc93e4dc3587' 
  AND token = 'ijgo6mRLdsjTKjbIBLzCTChJxAG0BoD4KFGAhYgQkow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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