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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830f35f4dfde967777697485a5591f1ab15268f184692fda0ec58395b58936d5' 
  AND token = 'YiIGA22eTVdnl7ej6ZqdRWt/RCkrM6L5iCnWIBiRT3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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