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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924b8b6546497533bd95020e48caaf631330943fae9df72fdfa38243405096a8' 
  AND token = 'tZwip0Aqke39FjuyCud5hqWClOH+wfsT3ITKrvERahg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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