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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1495622b50b71a78013bc6b422eb9d820b3eb6cad458c2e52572108fc5ca40d' 
  AND token = '0cY0o6DjJAbx2naNRACDW3va12j4Qp+GdjhYblEOXxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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