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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05aa57b1c9260ce32bf9c450d9b90261d79852ed0cc576ab20f76ce88e93dfd0' 
  AND token = '2AfQeINgOE6wnv+QvN07q+bmVPdZA41zWtyVnQGcFZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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