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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a856f845447d3abc8279f6fe8c758fa1d6ed1b4fd73b5d83633a294c63096e' 
  AND token = '7ajK0HLkydBDAdk9vwFcuCUT8gM7q40DhkthJ2tQi3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00190

JSON explain

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