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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28442baa5572e4c9a1d0ac2b030a02593cce80f4d5940340c90e78c78fd782b4' 
  AND token = '45zv+fl24m2UFyYUW70p5QxISlYK6Fo1MPNJOwP3wbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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