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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d14477d5b587abc6b49f5b8f10574e114e61f54c43b4a884d5325fcba27fc3' 
  AND token = 'd0k+8roefwuh6cu8wEuMxk2mdzseaVUFzBNYdf3uYto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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