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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee5a5ae7d1b29dc731a8446a2ca5d40d5c68bdbdc8b811846a341e77eedff04' 
  AND token = 'Z7Z+TkX7loLtAcIMGiGCqaeP+VPXLnIi4izhQ1HUkao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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