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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f4f97d55b405113cb21630b11c8a07c3f370cde88f11c925b6c3c89bbd49a8' 
  AND token = 'LhONoDIJ5btHPeJIGeS8xgu9u0wTtfqwfcWUxUIz6Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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