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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b9b404305cf0bba65e79900c1741f3c4be618f12c0f47d5f0ee29e0137875c' 
  AND token = 'NS2YdICBOeLSXZXUJp12mbLMbjz5acgkI2VUMO1FD08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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