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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf5e144ac24f7121fbd52f047cd97ea84895c71254127758552a67de0505982' 
  AND token = 'k/f4JPqjwkdmnBoijAJMNZS5NBQ+KJAHMXIUy86o0Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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