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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09715d9d3841c3f78e8b0e4a9169e7f68cf3a84e01363658c0f6cc29671019a7' 
  AND token = 'nDvn2M2AlL2mJknqnWnSSkdlBFb4C9QBk4FooAy/gIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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