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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e05af376bac503e3407856ba65ac136d09dab93ece464e344668eb4e5cdd7b0' 
  AND token = 'dfOUnYXs9WxMfW8EY+4UB2Ju8HjaCSMoXs7DcPv1iog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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