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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a0f324754beb3cd2df9e1380e01d5cbc166d9534efb7f71933f4d6263242e8' 
  AND token = 'SNInmYYTyroGKp54LwUJFJ31ifhz3tSjibWDNZIdun8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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