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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e13e6869c3213b16e760b02313758766e602af7a645ca9648f7fa6338785faf' 
  AND token = 'VNN1P4PafjQVhD7DRSN9yAXU42Lj8CJNsU/iCz87Ao0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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