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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35369b7f7fe1478494254a1f1227bd47acccac12bd10b7ad9e1603057d98a738' 
  AND token = 'wZxlfRuImXbw9Y73EcfS6+7PblmKEcLMZxfcAMaQ5FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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