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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9b02383ab04fd01db0a2eaeccd6105909d8d70231f4e129824f83d3a11330d' 
  AND token = 'IiTZm43jbyIYyiIf1EXjdgzqj+/sFIXI++mvi+16PUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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