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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d1c3fedc48ed926d0029b40370353970c3778b2113148b5446ffb53872912d' 
  AND token = '2bg8Z3mSa5ylIOJ5JOZamnmjs0N+n0oYp0a/MGFknT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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