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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd54f41ff0f779b9c49c3b7da2b0235dbf4f539efcd450fda35c264a12b213ce' 
  AND token = 'DInlQd5fuaZ4+SQf29bQvAaGCPoud8KxGYgi3oqGfxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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