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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36d3a561ef11276c12d45b33be074640cab76fab655d76d570bd46ab61c7909' 
  AND token = 'qYpaSgIUD6yRkdNwqH4SA1B5HSuyS8EcJmf9ZTpyGrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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