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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a41c7aaa011476b6ef5db870518e7194cd7e5060feb82f10bd282947fdd505' 
  AND token = '+DIvpOHpOlxmTG/Mb0p5cIO94eE+Zx06PuPxrekaqzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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