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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21be5d9c13e639fbf667d6b27d871909320e917be9946f6457cbb2d69fef6884' 
  AND token = 't5V7r5hJpPzf4NNoGSNtY3kBcomeK3ePGSN4hMMcmTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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