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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc3178c2b7d46587b5586964adaa9555e5ac82c1487e8d28ebea8ead0d79eb1' 
  AND token = 'nXotObFRyalP4qkQ9gfKOMk3y0UU/mmxTNajfzUkehQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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