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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3542bfd7388063ef73705bf2bdc828ef4287de5dc7b909277424b5382a8826e8' 
  AND token = 'JLDrF/z0bhdmu0XgvFDOUGd5uh9n4N+xO53DZXGw+S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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