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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cbd2eadf4b1c6fff37c0d7dc9953aec660f61ce4f25e13fc39047759fd1883e' 
  AND token = 'YDT8mozypk/tfZT3b+P0nP8G+RkURSZ4C+REclirCa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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