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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8731154108ffb107b5e4ab6ec65bf147538f438942e0198db04e1074d8b26e38' 
  AND token = 'Hz9yZiBz1Pzrw9TMYxBbz2xOZWK72l0sLg1XBJ7leyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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