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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7113b27d69420f6c4c266fdeb0a7239b745ea661b4685a294c7c94d36c160e9c' 
  AND token = 'd1WnfNV9WLCn4doqwT2hD2L582ZH6//29Qw3+wFBU/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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