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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb10333ec712057ae6a6f89449cdf32d8cd74125e6ab2e7fc5bf8c825adffe5' 
  AND token = 'SdZWcAe8XxcG+o+XOabTDvb66XWi3pRPsaD4uLUrkYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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