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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20ac0d9566f411d5893d35f0103b129dac47ee6f0d38ea25e2785ea985ddcea' 
  AND token = 'ay+8ImkFqDrAzXBIYSaanA+AQvlpa9Uw2Sdn6GoPBGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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