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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7d4e79280ac4818a8db53f93fa1eec8dd166bbec97944bd5f2bcda8afc56e4' 
  AND token = 'hN2XzY9B9Ju006FwmEun5NraMiL/jC3H6/s59GnteMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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