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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d09aab51931c8c1af850fddeef3b2372305ecaac1a0008b195127e77083880d' 
  AND token = 'YTakpS9TkICOp+udM+Q6uWBmY1lKlJfD4wvVhHTtqbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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