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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1999b6083fa24c9cbc33432d5b76cbeb261e6fb89751c8cf2d67c8c6ae4b18f5' 
  AND token = 'Cmhrsw7Ah7avyoUb31qt2QzxLAgW700MWE6gA9A0l2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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