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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178a5ca90bcbaf9a3b931538aa66c42f043457e971c64e5bd33093f740ec897f' 
  AND token = 'lpdAEQU92xFxlFQDp5q6lSvwBuP6nXElNWIyR0Oy71c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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