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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efca142ae3bea6db16898e8170666a0133138b1014a37226c42a945cedf91dc' 
  AND token = 'jqohb1W5UH1puiKBRXDvVh8KFdRLAbduWA6TD4B9gus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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