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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2815305a19692e9ece2e0398aa252c6ad73913781f4ec9c3a3d372fa217e9953' 
  AND token = 'MAP8WUugwefwYYtrZ2dsk8BGGVuLTrcXXMjC7SRVrLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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