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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c18390fa2494cbde7d5a4384a55ed732ff3e0f4d02e9f0daaea3aebd2ed2b2' 
  AND token = '3wubBAm1F6ig2GHPVdhUCZQtiyO2RGq8TcQuBhX4SDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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