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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0386062c1d3ea260e6c5eb32f526166b6759107d2be09cecdd5472adbd4ee9e4' 
  AND token = 'puaDtCmKRl3IswllDx1wq6zWZBsxncd57CV/+798GF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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