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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c13a178c2bb69774b524217ad3db2466e81eec2abf28c4e78ca56a7510daef' 
  AND token = 'L7XFaE8j19JG9YJflP2Uc+kz8j+yjm9cDjPrjk8R2hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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